note 69699 added to function.imagecopyresized

The function below will resize an image based on max width and height, then it will create a thumbnail image from the center of the resized image of a width and height specified. This function will not resize the image to max_w pixels by max_h pixels, those are only the max width's and heights the image can be, it resizes the image to the first 1:1 ratio below max_w and max_h. For example, if you have an image that is 800x600 and you specify your new image to be 400x200, it will resize based on the smallest number (in this case 200) and maintain the images 1:1 ratio. So your final image would end up at something like 262x200. UPDATE: I have updated this function, I added the 'newdir' option in case you want the images saved in a different directory than the script. I also fixed the thumbnail slice so it is perfectly in the center now and fixed the bug that 'ob at babcom dot biz' mentioned so you can safely resize based on width or height now. <? /********************************************************** * function resizejpeg: * * = creates a resized image based on the max width * specified as well as generates a thumbnail from * a rectangle cut from the middle of the image. * * @dir = directory image is stored in * @newdir = directory new image will be stored in * @img = the image name * @max_w = the max width of the resized image * @max_h = the max height of the resized image * @th_w = the width of the thumbnail * @th_h = the height of the thumbnail * **********************************************************/ function resizejpeg($dir, $newdir, $img, $max_w, $max_h, $th_w, $th_h) { // set destination directory if (!$newdir) $newdir = $dir; // get original images width and height list($or_w, $or_h, $or_t) = getimagesize($dir.$img); // make sure image is a jpeg if ($or_t == 2) { // obtain the image's ratio $ratio = ($or_h / $or_w); // original image $or_image = imagecreatefromjpeg($dir.$img); // resize image? if ($or_w > $max_w || $or_h > $max_h) { // resize by height, then width (height dominant) if ($max_h < $max_w) { $rs_h = $max_h; $rs_w = $rs_h / $ratio; } // resize by width, then height (width dominant) else { $rs_w = $max_w; $rs_h = $ratio * $rs_w; } // copy old image to new image $rs_image = imagecreatetruecolor($rs_w, $rs_h); imagecopyresampled($rs_image, $or_image, 0, 0, 0, 0, $rs_w, $rs_h, $or_w, $or_h); } // image requires no resizing else { $rs_w = $or_w; $rs_h = $or_h; $rs_image = $or_image; } // generate resized image imagejpeg($rs_image, $newdir.$img, 100); $th_image = imagecreatetruecolor($th_w, $th_h); // cut out a rectangle from the resized image and store in thumbnail $new_w = (($rs_w / 2) - ($th_w / 2)); $new_h = (($rs_h / 2) - ($th_h / 2)); imagecopyresized($th_image, $rs_image, 0, 0, $new_w, $new_h, $rs_w, $rs_h, $rs_w, $rs_h); // generate thumbnail imagejpeg($th_image, $newdir.'thumb_'.$img, 100); return true; } // Image type was not jpeg! else { return false; } } ?> Example: <?php $dir = './'; $img = 'test.jpg'; resizejpeg($dir, '', $img, 600, 400, 300, 150); ?> The example would resize the image 'test.jpg' into something 600x400 or less (retains the 1:1 ratio of the image) and creates the file 'thumb_test.jpg' at 300x150. ---- Server IP: 217.160.72.57 Probable Submitter: 68.105.66.135 ---- Manual Page -- http://www.php.net/manual/en/function.imagecopyresized.php Edit -- https://master.php.net/note/edit/69699 Del: integrated -- https://master.php.net/note/delete/69699/integrated Del: useless -- https://master.php.net/note/delete/69699/useless Del: bad code -- https://master.php.net/note/delete/69699/bad+code Del: spam -- https://master.php.net/note/delete/69699/spam Del: non-english -- https://master.php.net/note/delete/69699/non-english Del: in docs -- https://master.php.net/note/delete/69699/in+docs Del: other reasons-- https://master.php.net/note/delete/69699 Reject -- https://master.php.net/note/reject/69699 Search -- https://master.php.net/manage/user-notes.php